NDLI: Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured $MgAl_{2}O_{4}$ Ceramics

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Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured $MgAl_{2}O_{4}$ Ceramics

Content Provider	MDPI
Author	Klym, Halyna Karbovnyk, Ivan Piskunov, Sergei Popov, Anatoli I.
Copyright Year	2021
Description	Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials. Choosing technological modification of nanostructured $MgAl_{2}O_{4}$ spinel as an example, we show that for ceramics with well-developed porosity positron annihilation is revealed through two channels: positron trapping channel and ortho-positronium decay. Positron trapping in free-volume defects is described by the second component of spectra and ortho-positronium decay process by single or multiple components, depending on how well porosity is developed and on the experimental configuration. When using proposed positron annihilation lifetime spectroscopy approaches, three components are the most suitable fit in the case of $MgAl_{2}O_{4}$ ceramics. In the analysis of the second component, it is shown that technological modification (increasing sintering temperature) leads to volume shrinking and decreases the number of defect-related voids. This process is also accompanied by the decrease of the size of nanopores (described by the third component), while the overall number of nanopores is not affected. The approach to the analysis of positron annihilation lifetime spectra presented here can be applied to a wide range of functional nanomaterials with pronounced porosity.
Starting Page	3373
e-ISSN	20794991
DOI	10.3390/nano11123373
Journal	Nanomaterials
Issue Number	12
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-12-13
Access Restriction	Open
Subject Keyword	Nanomaterials Nanostructured Ceramics Positron Annihilation Positronium Decay Positron Trapping Free-volume Defects Nanopores
Content Type	Text
Resource Type	Article

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